2a7g

Classification and catalytic center
Thermolysin is a well researched metalloprotease containing zinc (click this!) and the amino acids His-Glu-X-His-His as its catalytic center. Glu-166, His-142 and -146 are grouped around the zinc atom, holding it fast, while Glu-143 holds the polarized water atom. Additionally, Tyr-157 and His-231 stabilize the substrate protein which will be cleaved into two smaller proteins.

About this Structure
2A7G is a Single protein structure of sequence from Bacillus thermoproteolyticus. Full crystallographic information is available from OCA.